I'go you one better than that. We moved from a condo (couple thousand sq ft) to a two story house with a garage, bonus room with storage on each side, two out buildings, 4000 sq ft, and 4 acres and can't seem to find places to put everything we own. Figure THAT physics out.
Bit it also went as you said as well. Here's where I think we make mistakes with local moves (mine was about 4 miles). We think to ourselves "Nah. No need to pay for the big truck. We'll just get the little one and make a few trips. It's only a few miles, right?" Well, I learned the hard way (as you are now) that is DUMB! When moving hundreds of miles, people get the big truck and make it all fit in one run. Sometimes it even forces them to decide if they even NEED all that junk before moving. So they get rid of some of it. But those of us moving locally say (again) "Nah. No need to purge everything right now. We're only moving it a few miles, right?" STILL dumb.
If I ever move in this area again I am going to plan the move as if I were moving across country. Anything I don't have to have is going away and it's all going in ONE TRIP.